title: [Inhibitory effects of gamma secretase inhibitor on human multiple myeloma xenograft mouse model].
abstract: OBJECTIVE
  To explore the tumor growth inhibition of gamma secretase inhibitor MRK003 on human multiple myeloma xenograft mice by inhibition of AKT and Notch1 expression.
  
  
  METHODS
  NOD/SCID mice were injected with human multiple myeloma cell lines RPMI8226 to establish a xenograft mouse model. Mice were randomized into two groups：the experimental group were injected with MRK003 at a dose of 5 mg× kg⁻¹×d⁻¹ for 14 days; the inhibitor was replaced by an equal saline in the control group. Mice were sacrificed by cervical dislocation on the next day after the last injection and tumor tissue was removed to detect the expression of Notch1 and AKT by immunohistochemistry.
  
  
  RESULTS
  After subcutaneous injection with RPMI8226, mice had tumor formation in 5-7 days and the largest tumor block in 10-12 days. Before RPMI8226 injection, the mean sizes of tumor block in the experimental and the control groups were 509.2 mm³, 511.2 mm³(P>0.05). 9 days after injection, the mean sizes of tumor tissue in the experimental and the control groups were 636.6 mm³, 691.2 mm³(P<0.01). On the next day after the last injection, the tumor sizes of the experimental and the control groups were 683.5 mm³ and 1798.7 mm³(P<0.01). The size of tumor block in the experimental group was significantly smaller than that of the control group(P<0.01). Immunohistochemistry staining showed that the positive expression rates of Notch1(11.1%, P<0.01) and AKT(13.3%, P<0.01) in experimental group were significantly decreased compared with the control group(Notch1: 95.6%; AKT: 93.3%). Western blot results showed that Notch1 and AKT protein in experimental group were significantly lower than those in the control group.
  
  
  CONCLUSIONS
  MRK003 could inhibit the tumor growth of human multiple myeloma xenograft mice by downregulated expression of Notch1 signaling pathway.
authors.affiliation: Department of Hematology, The Central Hospital of Taian, Taian 271000, China.
authors.forename: Qin-qin
authors.initials: QQ
authors.lastname: Liu
authors.forename: Jia-li
authors.initials: JL
authors.lastname: Liu
authors.forename: Dong-mei
authors.initials: DM
authors.lastname: Guo
authors.forename: Qing-liang
authors.initials: QL
authors.lastname: Teng
mesh_terms: D053829:Amyloid Precursor Protein Secretases / Q000037:antagonists & inhibitors*; D000818:Animals; D045744:Cell Line, Tumor; D003499:Cyclic S-Oxides / Q000494:pharmacology*; D006801:Humans; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D009101:Multiple Myeloma / Q000188:drug therapy / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D051881:Receptor, Notch1 / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*; D013830:Thiadiazoles / Q000494:pharmacology*; D023041:Xenograft Model Antitumor Assays
chemical_list: D003499:Cyclic S-Oxides; C523799:MRK 003; C497762:Notch1 protein, mouse; D051881:Receptor, Notch1; D013830:Thiadiazoles; D051057:Proto-Oncogene Proteins c-akt; D053829:Amyloid Precursor Protein Secretases